Rectangle extension.

I just wonder, is it possible to create a rectangle extension in AI2?  Can one modify the ball.java file, and based on that create a rectangle instead?

Is this a complicated thing to do?

From the ball.java code:

protected void onDraw(Canvas canvas) {

    if (visible) {

      float correctedXLeft = (float)(xLeft * form.deviceDensity());

      float correctedYTop =  (float)(yTop * form.deviceDensity());

      float correctedRadius = radius * form.deviceDensity();

      canvas.drawCircle(correctedXLeft + correctedRadius, correctedYTop +

          correctedRadius, correctedRadius, paint);

    }

  }

Is there any kind of canvas.drawRectangle?

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Next time search the gallery:

ai2.appinventor.mit.edu/?galleryId=5703925407154176

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So I know I haven't explained exactly what I want.  To create a function like this is no probelm (that I've already done)

But I want to add events to my rectangle.  For the ball component you have:

When ball1 collide with

When ball1 dragged

When  ball1 edge reached

when ball1 flung

when ball1 toucdown

and so on.  I don't think thats possible with this solution?

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A ball is really a sprite, so, you can make a sprite with the image of a rectangle, give it any width and height you need, since pixelation or distortion doesn't matter in this case and that's it. You have a "rectangular ball"!

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But isn't your rectangle just a Sprite with a very boring rectangular image?

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Sure, one can use an image of a rectangle.  So if one would change the colour of this rectangle, you have to add a new image.  

Ok, thats a workable solution, but not the most elegant......

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You can draw a rectangle of any color possible, save the canvas as a file, then use that file as the sprite picture.

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Not sure how to save a canvas..... BUT: I have created 2 images (png) with size 100X100 px.  And I am able to change picture and then colour of the rectnagle!!

If I change height  or wdith of the imagesprite it will work as long as it is less than 100X100px.  Thanks for your adivse,  I guess this is much easier than creating an extension:)

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